Quicksilver 47508T Brass Retaining #1 Thermostat Sleeve for Select MerCruiser V6 and V8 Engines SOFT PLASTICS hardened brass main gear and

hardened brass main gear and cut with Japanese Hamai precision

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Maintains engine horsepower and efficiency

Large blade area for maximum thrust

Quicksilver 47508T Brass Retaining #1 Thermostat Sleeve for Select MerCruiser V6 and V8 Engines SOFT PLASTICS hardened brass main gear andThermostat sleeve 47508T is a critical brass retaining component designed for early MerCruiser V6 and V8 thermostat housings. Engineered specifically for high horsepower sterndrive and inboard engines with Design #1 housings, this sleeve ensures your thermostat remains properly seated for reliable cooling system regulation. Produced to meet Mercury Marine original equipment manufacturer specifications. Brass retaining sleeve for early Design #1